function preg_quote( str ) {	// Quote regular expression characters
	// 
	// +   original by: booeyOH
	// +   improved by: Ates Goral (http://magnetiq.com)

	return str.replace(/([\\\.\+\*\?\[\^\]\$\(\)\{\}\=\!\<\>\|\:])/g, "\\$1");
}